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• The use of thionyl chloride eliminates this problem.

• This problem is remedied by prescribing the appropriate vitamin supplements.

• To circumvent (or obviate) a difficulty, one has to ...

• This problem has been countered (or rectified) by the addition of ...

• The difficulty is easily solved by the use of ...

• To get around this difficulty, many plants have ...

• To overcome (or deal with) the difficulty, you have to ...